>pfam01612 3_5_exonuc 3'-5' exonuclease. This domain is responsible for the 3'-5' exonuclease proofreading activity of E. coli DNA polymerase I (polI) and other enzymes, it catalyses the hydrolysis of unpaired or mismatched nucleotides. This domain consists of the amino-terminal half of the Klenow fragment in E. coli polI it is also found in the Werner syndrome helicase (WRN), focus forming activity 1 protein (FFA-1) and ribonuclease D (RNase D). Werner syndrome is a human genetic disorder causing premature aging; the WRN protein has helicase activity in the 3'-5' direction. The FFA-1 protein is required for formation of a replication foci and also has helicase activity; it is a homologue of the WRN protein. RNase D is a 3'-5' exonuclease involved in tRNA processing. Also found in this family is the autoantigen PM/Scl thought to be involved in polymyositis-scleroderma overlap syndrome.

Probab=98.00 E-value=0.00055 Score=44.35 Aligned_cols=135 Identities=20% Similarity=0.122 Sum_probs=78.8 Q ss_pred CCEEEEECCCCCCCCCCCEEEEEEEEEECCCCEECCEEEEEEECCCCCCCCCHHHHHHHCCCHHHHHHCCCCHHHHHHHH Q ss_conf 83799975278898772604899999983897280400226621788877857898985799889960799979999999 Q gi|254780661|r 3 NHFVIYDYETFGRDVALDRPAQFAGVRVDRQWEKIESTEVFFCKPADDYLPDPEAVFITGITPQKALRDGVVEAEFSRRI 82 (471) Q Consensus 3 ~~~v~~D~ETtG~~~~~~~iiq~~~i~~d~~~~~~~~~~~~~~~~~~~~~p~p~a~~v~git~~~~~~~~~~~~e~~~~i 82 (471) T Consensus 20 ~~~ia~DtEt~~~~~~~~~~~~~llq~~~~~-----~~--y--------li~~~-----------------~~~~~~~~L 67 (172) T pfam01612 20 AKVVAVDTETTSLDTYSYTLVGCLIQISTGE-----GA--Y--------IIDPL-----------------ALGDDLEGL 67 (172) T ss_pred CCCEEEEEECCCCCCCCCCCCEEEEEEECCC-----CC--E--------EEECC-----------------CCHHHHHHH T ss_conf 9908998062898867613433699996798-----60--7--------76434-----------------756679999 Q ss_pred HHHHHCCCCEEEEEECHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHCCCCCCCCCCCCCCHHH Q ss_conf 99951179659995055789999999998507853213256887100158888655565321002444445443310898 Q gi|254780661|r 83 HQFFSVPNTCIIGYNNIRFDDYYSRNIFYRNFYDSYRWSWDNGNSRWDLLDVMRAIYAFSPDGIQWPSRDDGATSFKLQD 162 (471) Q Consensus 83 ~~~~~~~~~~~ig~N~~~FD~~~lr~~~~r~~~~~y~~~~~~~~~~~D~l~~~~~~~~~~p~~~~~~~~~~~~~~~kL~~ 162 (471) T Consensus 68 ~~ll~~~~i~Kvghn-~k~D~~~L~~~~~---~~--------~~~~~Dt~~a~~---~l~~~-----------~~~gL~~ 121 (172) T pfam01612 68 KRLLEDPNITKVGHN-AKFDLEVLARDFG---IK--------LENLFDTMLAAY---LLGYP-----------RSHSLDD 121 (172) T ss_pred HHHHCCCCCCEEEEE-HHHHHHHHHHHCC---CC--------CCCCHHHHHHHH---HCCCC-----------CCCCHHH T ss_conf 999759998799975-8999999988547---66--------687327899998---81996-----------4356999 Q ss_pred HHHH-HCCCCC----------------CCCHHHHHHHHHHHHHHHHHHHH Q ss_conf 9987-188764----------------31013331899999999998642 Q gi|254780661|r 163 LALA-NGIEHV----------------NAHDAKADVYATLALVWLIREKK 195 (471) Q Consensus 163 la~~-n~i~~~----------------~aH~A~~D~~~t~~l~k~i~~~~ 195 (471) T Consensus 122 L~~~~lg~~~~K~~~~s~w~~rpL~~~qi~YAa~Da~~~~~l~~~l~~~l 171 (172) T pfam01612 122 LAEKYLGVELDKSEQCADWRARPLSEEQLRYAAEDADYLLRLYDKLRKEL 171 (172) T ss_pred HHHHHCCCCCCHHHEECCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHH T ss_conf 99998098787441566788789829999999999999999999999974

HHsearch alignment for GI: 254780661 and conserved domain: pfam01612